Nadolig Llawen oddi wrth Yr Athro Ardd a Bwlb Bychan!

Diolch i'r holl ysgolion sydd wedi  cofnodi ac anfon eu data dros y misoedd diwethaf. Rwy'n edrych ymlaen at glywed am pan fydd y blodau yn dechrau tyfu yn y Gwanwyn!

 Mae rhai ohonoch wedi adrodd am genllysg neu hyd yn oed eira! Ewch i weld eich sylwadau isod. Wythnos ddiwethaf yng Nghaerdydd, roedd gennym gryn dipyn o genllysg. Hyn wedi gwneud i mi ryfeddu, sut yn union mae cerrig cenllysg ffurfio? Roedd yr atebion gyda Derek (The Weatherman). Cliciwch yma i weld ei flog a llun o garreg genllysg mawr a oedd wedi gwmpo ger Caerdydd yn 1968. http://www.bbc.co.uk/blogs/walesnature/2011/12/how_hailstones_are_formed.html

Mwynhewch eich gwyliau!

Yr Athro'r Ardd

Saturday 19 November

Today began grey, overcast and cold, with light snow falling on the ship. We’ve now been breaking our way through the pack ice of the Ross Sea for three days, picking our way south through whatever open leads or thin ice present themselves.

On the southern horizon, in places, open water shows up as dark reflections on the underside of the cloud - a ‘water sky’. In other places, we see ice blink, where the clouds are brightened by the presence of the sea ice beneath. Our navigation through the pack is aided by satellite positioning; Scott relied upon dead reckoning and the sun to chart his progress.

This afternoon we sighted land for the first time in five days. Away to the west we’ve had our first glimpse of the continent of Antarctica. The faint, white, distant mountains rise to over 3500 metres. Appropriately, one of the first we see, Mount Murchison, is named after a geologist who worked in Wales 180 years ago.

We set course for the mainland, a point called Cape Washington, but the pack ice is too thick, even for our icebreaker. Instead, we’re continuing south, deeper into the Ross Sea, in the hope of breaking out of the pack and into a polynya, which satellite pictures show lies to the south of us.

Sunday 20 November

It’s been slow getting through the pack ice, but we’ve finally made it to Franklin Island, at 76o south.

The ice is thick around the island, but we got within 5 miles of it, so we took the helicopters and landed on the sea ice at the foot of steep black cliffs. From there we hiked about a mile and half south across the ice to a large colony of Emperor penguins at the southeastern end of the island. These are the stars of the movies March of the Penguins and Happy Feet. They walk long distances across the ice to breed, and after the egg is laid it is transferred to the male who then stands on the ice through the severe Antarctic winter holding it on his feet.

The males in the colony huddle together against the cold. The march of the penguins was first observed by Captain Scott on his first expedition. Their chicks are some of the cutest things on the planet and infitinely photogenic. We have a couple of examples of Emperor penguins in our collections in Cardiff, including one presented to us by Lt Teddy Evans of Scott’s last expedition, and that will be in January.

This morning I presented my last talk to the Fisheries Department which was about the methods of collecting and identifying polychaetes. It seemed to go down reasonably well and then I handed back my key and left for the last time.

My samples are now officially with the Post Office hopefully to be on their way back to the UK shortly. As for me my journey back starts at 5am tomorrow morning. It will already be daylight then and will be the last time I see daylight at that time of the morning for a few months to come. Arrival back in the UK is likely to be a bit of a shock for me I think as there is currently around 8 or 9 hours less daylight there each day than here and the weather is now decidedly wetter and colder. Shortest day is fast approaching in the UK with longest day due here next week. Ah well.

Several weeks ago I pointed out that my challenge would be to still be finding new animals on Day 28. By my calculations that would actually be today so I failed there as there has been no new sampling since Friday which was Day 25. However, as I did have a new worm that day, from my final site, I think that’s pretty good going!

My sampling here has gone well and I’m really pleased with the variety of animals I have been able to collect. I’m looking forward to being able to spend some time looking at them in more detail in the New Year. I’ve enjoyed my time here and had an amazing opportunity to visit a place and see things that many others won’t get a chance to and I appreciate how lucky I’ve been.

I know that some of the people I’ve meet here have also been reading this blog and I’d like to take the opportunity to thank everyone involved for all of the help I’ve had getting out here and during my stay, from loaning me cars to get around to coming out on the shores with me or taking me diving to get more samples. This trip wouldn’t have been nearly as successful without all of your help.  

 
The Shallow Marine Surveys Group, whose survey work I piggy-backed to go diving, do a fantastic job out here with their dive surveys, mostly as volunteers with a few grants to help with costs and the Fisheries Department allowed me free run of their lab at all hours.

Not least of course I must thank the Shackleton Scholarship Fund and National Museum Wales who have funded and supported this visit.

Thank you all!

My directions turned out to be accurate and easy to follow and I arrived at Teal Creek in plenty of time for the tide. The biggest problem I had was deciding where to stop along the creek. At the time I arrived the tide still had a way to go out so it was difficult to know how much ground would be uncovered. I made my decision and walked out into the small inlet off the creek (photo 1). The area was very soft but the depth of the mud varied and I didn’t venture too far into deeper areas, wary of getting stuck. As I dug around I was surprised to find the same new ragworm that I had found at Sand Bay the previous day, having not found it at any site before and now two in a row. There were also many of the bamboo worms that seem to dominate the shores here.

I left the creek shortly before actual low tide in order to give myself time to get over to Camilla Creek where low tide would be in just over 2 hours time. The tide hadn’t gone down much for a while so I didn’t think I would be missing anything new being uncovered.  As I drove out past the previous choices I had had for stopping in the area I realised that the earlier bays had much larger areas of mud flat exposed and I thought maybe I had made a mistake in my choice of sampling site. However, on reflection, the water had retreated to the far side of the creek from these bays and that would have left me with no access to water across the mud which is essential during the collecting, so I probably did make the right choice after all.

Camilla Creek was reached fairly quickly with some expanses of mud flat already exposed. It was a much larger, wider creek (photo 2) than Teal but the shore itself seemed more gravelly leading down to it. I quickly realised that although the approach was easier, the mud itself was softer and deeper and probably not to be ventured too far into without additional company for safety and better sampling gear than what now felt like a very short pair of wellies. After extricating myself from the mud I skirted around the edge of the water level in the small bay sampling different spots and finding quite a variety of different mud, sand and hard areas to try.

Eventually it was time to leave for the journey back. This time I kept the window tightly shut and arrived back slightly less dusty than the previous night. There was at least one new worm for my list from the samples in the form of another different paddleworm (photo 3).

Saturday saw the last of the formaldehyde to alcohol changing where possible. The later samples would all have to stay in formaldehyde though as they needed to stay in that fluid for at least a few days to make sure they were properly ‘fixed’ before being moved to alcohol. That will now be done after both I and they arrive back in Cardiff. This was then followed by several hours of painstakingly sealing and taping around the lid of each pot and then sealing them into bags in order to reduce the risk of any fluid leakage during transport. As there were around 200 pots to do this took a while! The photo shows all of the pots at various stages of packing.

This morning (Sunday) saw a few more hours of sealing and packing until I had 7 boxes of packed samples ready for posting tomorrow (I can’t bring them back on the plane with me sadly).
There had been plans to do a last shore dive locally this afternoon but unfortunately the wind has scuppered our plans, blowing strongly all day. As it would have been a shallow site with entry off the shore, the windy conditions would have made getting in and out of the water difficult, conditions underwater uncomfortable and visibility poor, so an obvious decision was made. Still disappointing though as everyone had told me what a lovely dive it was going to be!

Tomorrow’s plan includes my final talk at the Fisheries Department in the morning followed by getting those parcels on their way and then getting my own packing started. Only one more day left here!